1. Using the word bank below (some terms do not apply!), dissect the molecules shown. You may use circles and arrows to label key features. WORD BANK: PBL: Building Lipids; BIOL 1107, R. Mans, Fall 2015 CHALLENGE #1 Carbonyl Hydroxyl Amino Phosphate Carboxyl (-) charge (+) charge polar basic acidic Hydrophobic Hydrophilic Fatty Acid Head Group Glycerol

2. Using the word bank below (some terms do not apply!), dissect the molecules shown. You may use circles and arrows to label key features. PBL: Building Lipids; BIOL 1107, R. Mans, Fall 2015 ANSWERS: CHALLENGE #1 Phosphate (-) charge Hydrophilic Head Group Fatty Acid (unsaturated) Carboxyl Lipid Tail Carboxyl acidic Hydrophobic Fatty Acid (saturated) Lipid Tail Hydrophobic acidic (+) charge Hydroxyl polar Glycerol polar

3. A. If you were going to build a saturated fat, circle the parts you would need, and indicate how many of each. WORD BANK: PBL: Building Lipids; BIOL 1107, R. Mans, Fall 2015 CHALLENGE #2 Phosphate (-) charge (+) charge Hydrophobic Hydrophilic Head Group Lipid tail B. Draw the structure of the saturated fat you created, and label the building blocks and key features using the word bank. For what purpose would an organism be most likely to use this molecule? Glycerol Fatty Acid Ester linkage Glycosidic linkage

4. A. If you were going to build a saturated fat, circle the parts you would need, and indicate how many of each. PBL: Building Lipids; BIOL 1107, R. Mans, Fall 2015 ANSWERS: CHALLENGE #2 Hydrophobic Lipid tail B. Draw the structure of the saturated fat you created, and label the building blocks and key features using the word bank. For what purpose would an organism be most likely to use this molecule? Glycerol *Building Block* Ester linkage Glycerol Fatty Acid (saturated) X 3 X 1 Fatty Acid (saturated) *Building Block* BIOLOGICAL PURPOSE: ENERGY

5. A. If you were going to build a phospholipid, circle the parts you would need, and indicate how many of each. WORD BANK: PBL: Building Lipids; BIOL 1107, R. Mans, Fall 2015 CHALLENGE #3 Phosphate (-) charge (+) charge Hydrophobic Hydrophilic Head Group Lipid tail B. Draw the structure of the phospholipid you created, and label the building blocks and key features using the word bank. For what purpose would an organism be most likely to use this molecule? Glycerol Fatty Acid Ester linkage Glycosidic linkage

6. A. If you were going to build a phospholipid, circle the parts you would need, and indicate how many of each. PBL: Building Lipids; BIOL 1107, R. Mans, Fall 2015 ANSWERS: CHALLENGE #3 Phosphate (-) charge (+) charge B. Draw the structure of the phospholipid you created, and label the building blocks and key features using the word bank. For what purpose would an organism be most likely to use this molecule? Fatty Acid * Building Block Ester linkage BIOLOGICAL PURPOSE: LIPID BILAYER (MEMBRANE) X 1 2 fatty acids (saturated or unsaturated) X 1